Gado is character from the Bloody Roar series who is professional mercenary and military genius who was friends with Yugo's father Yuji. During his time on the battlefield Gado adopted a Young girl named Shina as his daughter who has followed in her fathers footsteps.

Morino Ibiki is a Jonin Commander, a member of the Konoha Black Ops and the head of the Torture and Interrogation Corps unit. In Volume 5 he was the proctor and chief examiner for the first part of the Chunin Exam.

Takatou Iori, a high school student, while on his way to confess to the girl of his dreams, just so happens to see a little girl who is about to get hit by a car. In an act of heroism, Iori jumps in to save her, and gets critically injured. Thankfully, he is saved by the super genius, Kusanagi Yume. Unfortunately, Yume is a female lolicon, and has turned him into a loli!

Jin Kazama is the son of Jun Kazama and Kazuya Mishima the grandson of Heihachi Mishima in the Tekken videogame franchise.
He makes a brief cameo at the end of the animated Tekken film, his only appearance in an anime to date

The head of the British Library Special Operations Unit and Yomiko's former boss, most known as Mr. Carpenter. After the fall of the Gentleman and the decline on England's influence in the world he plots an evil scheme to take control over the world, whatever it costs.